From 85a9cdd052449b6dbbe680f0232ca9cbecd21a8c Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Thu, 5 Oct 2017 17:34:26 +0200
Subject: [PATCH] Add a way to get access to OpenGL texture index

---
 panda/src/glstuff/glTextureContext_src.cxx | 21 +++++++++++++++++++++
 panda/src/glstuff/glTextureContext_src.h   |  3 +++
 panda/src/gobj/textureContext.cxx          | 21 +++++++++++++++++++++
 panda/src/gobj/textureContext.h            |  2 ++
 4 files changed, 47 insertions(+)

diff --git a/panda/src/glstuff/glTextureContext_src.cxx b/panda/src/glstuff/glTextureContext_src.cxx
index a56d6a20a4..e36f8f756e 100644
--- a/panda/src/glstuff/glTextureContext_src.cxx
+++ b/panda/src/glstuff/glTextureContext_src.cxx
@@ -95,6 +95,27 @@ reset_data() {
 #endif
 }
 
+/**
+ * Returns an implementation-defined handle or pointer that can be used
+ * to interface directly with the underlying API.
+ * Returns 0 if the underlying implementation does not support this.
+ */
+uint64_t CLP(TextureContext)::
+get_native_id() const {
+  return _index;
+}
+
+/**
+ * Similar to get_native_id, but some implementations use a separate
+ * identifier for the buffer object associated with buffer textures.
+ * Returns 0 if the underlying implementation does not support this, or
+ * if this is not a buffer texture.
+ */
+uint64_t CLP(TextureContext)::
+get_native_buffer_id() const {
+  return _buffer;
+}
+
 /**
  *
  */
diff --git a/panda/src/glstuff/glTextureContext_src.h b/panda/src/glstuff/glTextureContext_src.h
index 309550eced..9a345b397d 100644
--- a/panda/src/glstuff/glTextureContext_src.h
+++ b/panda/src/glstuff/glTextureContext_src.h
@@ -33,6 +33,9 @@ public:
   virtual void evict_lru();
   void reset_data();
 
+  virtual uint64_t get_native_id() const;
+  virtual uint64_t get_native_buffer_id() const;
+
 #ifndef OPENGLES
   void make_handle_resident();
   GLuint64 get_handle();
diff --git a/panda/src/gobj/textureContext.cxx b/panda/src/gobj/textureContext.cxx
index b0130bcf24..32224a7bde 100644
--- a/panda/src/gobj/textureContext.cxx
+++ b/panda/src/gobj/textureContext.cxx
@@ -15,6 +15,27 @@
 
 TypeHandle TextureContext::_type_handle;
 
+/**
+ * Returns an implementation-defined handle or pointer that can be used
+ * to interface directly with the underlying API.
+ * Returns 0 if the underlying implementation does not support this.
+ */
+uint64_t TextureContext::
+get_native_id() const {
+  return 0;
+}
+
+/**
+ * Similar to get_native_id, but some implementations use a separate
+ * identifier for the buffer object associated with buffer textures.
+ * Returns 0 if the underlying implementation does not support this, or
+ * if this is not a buffer texture.
+ */
+uint64_t TextureContext::
+get_native_buffer_id() const {
+  return 0;
+}
+
 /**
  *
  */
diff --git a/panda/src/gobj/textureContext.h b/panda/src/gobj/textureContext.h
index 7f5a514c81..813cd37dd9 100644
--- a/panda/src/gobj/textureContext.h
+++ b/panda/src/gobj/textureContext.h
@@ -37,6 +37,8 @@ public:
 PUBLISHED:
   INLINE Texture *get_texture() const;
   INLINE int get_view() const;
+  virtual uint64_t get_native_id() const;
+  virtual uint64_t get_native_buffer_id() const;
 
   INLINE bool was_modified() const;
   INLINE bool was_properties_modified() const;